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<head>
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    <title>贪吃蛇</title>
</head>
<body>
    <div id="box">
        <button type="button" class="btn btn-outline-primary" value="9">9宫格</button>
        <button type="button" class="btn btn-outline-primary" value="16">16宫格</button>
        <button type="button" class="btn btn-outline-primary" value="25">25宫格</button>
        <button type="button" class="btn btn-success" value="10">新手</button>
        <button type="button" class="btn btn-danger" value="20">困难</button>
        <button type="button" class="btn btn-secondary" value="30">地狱</button>
    </div>
    <div class="bg"></div>
</body>
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